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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bacf91c2feb4a164203386991bd3743b2e5e726c30343feda761c3e9ac3bd23' 
  AND token = 'YzeVqoDbkzxzXYMextSDwpjoEeJT8C8+rHet0l63BxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}